The aircraft dp file specifies where and how many of the rockets would be attached to the airframe so that does not account for them falling.
The dp file for the rocket would be the culprit.
The objec'st dp specifies what the object is and does in the [MISC_DATA] section by a number code in the unit_family, the category, and the weapon type lines.
For a rocket that would be
unit_family=4
category=37
max_weight= whatever that should be
weapon_type=5
I've posted this before but it's always useful to post again, here are all of the dp codes that we know about:
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Reference data for dp files
DPs All
Unit_Family
1=fighter
2=bomber
3=vehicle
4=Ground Unit or object
5=boat or ship
7=carrier
Category
1 - aircraft fighter
2 - aircraft level bomber (B-24, Sally)
3 - aircraft dive bomber (Stuka, Dauntless, Val)
4 - aircraft torpedo bomber (Avenger, TBD)
5 - aircraft tactical bomber (B-25, Betty, I also have Kate in this Cat.)
6 - aircraft strike (I need to do some serious testing with this one)
7 - aircraft civil
8 - aircraft recon
9 - aircraft transport (C-47)
10 - aircraft fighter-bomber (any fighter equipped with Bombs or Torps) or dive bomber
Category codes for non-aircraft objects:
13 - ship aircraft carrier
14 - ship cruiser
15 - ship destroyer
16 - ship submarine
17 - ship battleship
18 - ship patrol
19 - ship auxiliary
21 - tracked vehicle
22 - wheeled vehicle
23 - train car
24 - amphibious vehicle
29 - artillery static
30 - mechanical equipment
31 - structure static
32 - factory
33 - non-target object
34 – runway
37 - payload object defined by weapon_type
Weapon_type=1 (small bomb) - 30lb, 100lb, 250lb, 30kg, 60kg all uses the small FX.
Weapon_type=2 (medium bomb) - 500lb, 250kg uses the medium FX.
Weapon_type=3 (large bomb) - 1000lbm 2000lb, 800kg uses the large FX.
Weapon_type=4 (large bomb, same as above)
Weapon_type=5 (rocket)
Weapon_type=6 (rocket)
Weapon_type=7 (rocket)
Weapon_type=8 (timed rocket) - 8 seconds
Weapon_type=9 (torpedo) - MK13, seems to be for lighter torps.
Weapon_type=10 (torpedo) - Type91, seems to be for heavier torps.
Weapon_type=11 (???)
Weapon_type=12 (???)
Weapon_type=13 (???)
Weapon_type=14 (???)
Weapon_type=15 (Tank) - Jap 330litre, Jap 200litre, corsair/hellcat/lightning tanks, most picked.
Weapon_type=16 (Tank) - US 200 gallon.
Weapon_type=17 (Tank) - US 150 gallon.
Weapon_type=18 (???)
Weapon_type=19 (???)
Weapon_type=20 (Pylons, Pods, Parts) Used for rocket pods, various pylons and SID pilot.
Weapon_type=??? Not sure how far it goes.
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All weapons are....
unit_family=4
category=37
They also use...
max_weight=
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[MISC_DATA]
min_speed= kph
cruise_speed= kph
max_speed= kph
min_alt= meters
cruise_alt= meters
max_alt= meters
NOTE: [MISC_DATA] entries ARE IN METRIC: